Reversing-gear



(No Model.) 2 Sheets-Sheet 1.

H. O. THOMAS. REVERSING GEAR.

No. 433,499. Patented 'Aug. 5. 1890.

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H. 0. THOMAS. RBVBRSING GEAR.

No. 433,499( Patented Au 5,1890.

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UNITED STATES PATENT OFFICE.

HARRY O. THOMAS, OF CHERRY VALE, KANSAS.

REVERSlNG-GEAR.

SPECIFICATION forming part of Letters Patent No. 433,499, dated August 5, 1890. Application filed December 21, 1889. Serial No. 384,506. (No model.)

To all whom it may concern.-

Be it known that I, HARRY O. THOMAS, a citizen of the United States, residing at Cherry Vale,in the county of Montgomery and State of Kansas, have invented a new and useful Reversing-Gear, of which the following is a specification.

This invention relates to valve-reversing gear for steam-engines; and it has for its object to provide a reversing mechanism which shall be simple in construction and easily applied to steam-engines of ordinary construction, and by means of which the valve mechanism may be perfectly controlled, regulated, and reversed, as may be required.

The invention consists in the improved con-' struction, arrangement, and combination of parts,which willbe hereinafterf ully described,

and particularly pointed out in the claims.

In the drawings hereto annexed, Figure 1 is a perspective view showing my invention applied to a steam-engine of ordinary construction. Fig. 2 is a side elevation, on a larger scale, of the parts comprising my invention. Fig. 3 is a top view. Fig. 4 is a transverse sectional detail view.

Like numerals of reference indicate like parts in all the figures.

1 designates the bed or base which supports the cylinder 2 and valve-chest 3.

4: 4 designate the gibs on which slides the cross-head 5, which is connected with the piston -rod 6 and with the pitman 7, the opposite end of which is connected with the wrist-pin or crank 8 upon the main shaft 9, which latter is journaled in boxes or bearings 1O 10 of the machine in the usual manner. All the foregoing parts form no part of myinvention, and they may be varied or modified in a variety of ways. The main shaft 9 is provided with two eccentric disks 11 12, and at one end of the said main shaft a fiy-wheel 13 may be mounted in the usual manner.

let designates the link or hanger which is mounted pivotally on abearing 15, and which is provided at its lower end with a yoke 16, which is connected pivotally with one corner of a triangular frame 17, the shape of which is approximately that of an isosceles triangle, and which is supported by means of the said yoke or hammer.

18 19 designate two eccentric rods, connecting the eccentric disks 11 and 12, respectively, with the rear corners 20 and 21 of the triangular frame 17, to the latter of which corners the yoke or hanger 14 is likewise connected.

22 designates a rod or connecting arm, which is mounted pivotally at the front corner 23 of the frame 17, and is provided at its rear end with a head 24, sliding in a segmental slot 25 in the base of the triangular frame 17. The head 24. is connected bya pivoted rod 26 with thevalve-stem 27. The said head 24 is also connected by a link 28 with one arm 29 of a bell-crank lever mounted pivotally at 30, and which constitutes the reversing-lever, and the vertical arm 31, which forms a handle by means of which it may be operated, said handle being adapted to engage a segmental rack 32 for the purpose of retaining it in any position to which it may be adjusted.

The operation of this invention will be readily understood from the foregoing description taken in connection with the drawings hereto annexed. The triangular frame is suspended, as will be seen, from the link or hanger 14, and it oscillates upon a fulcrum which is determined by the position of the adjustable head 2%, which is manipulated by means of the reversing-lever. It will be seen that when the valve is at either end of its stroke and the head 2A is moved from one end of the slot 25 to the other the position of the valve is instantly reversed in an exceedingly convenient and certain manner.

None of the strain transmitted between the eccentric 11 or 12 and the valve-stem 27 comes upon the segmental slot, but upon the hearing 23 in frame 17.

Having thus described my invention, what I claim, and desire to secure by'Letters Patent, 1s-

1. In a reversing-gear for steam-engines, the combination of the valve-rod, the connectingrod 6, the triangular frame having segmental slots 25, and the connecting-arm 22, pivoted at the point of said triangular frame and connected pivotally with the connecting-rod 26 by means of a head 2-Lt, mounted to slide in a segmental slot in said triangular frame, and a link. connecting said sliding head with the reversing-lever, substantially as and for the pur pose set forth.

2. In a reversing-gear for steam-engines,

the combination of the triangular frame, suspended from a link or hanger and having a corner of the frame, and the link connecting the said sliding head with the reversinggear, substantially as and for the purpose set forth.

3. In a valve-reversing gear, the combination, with the triangular frame connected pivotally with the eccentric-rods and having a sliding head mounted in a segmental slot in said frame and connected pivotally with links or rods, the opposite ends of which are connected, respectively, with the front corner of the frame, with the valve-stem, and with the reversing-lever, of a link or hanger mounted pivotally in suitable bearings and terminating at its lower end in a yoke connected pivotally with and supporting the said triangular frame, substantially as and for the purpose herein set forth.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two Witnesses.

HARRY O. THOMAS.

Witnesses:

JOSEPH ROWAND, R. A. ROGERS. 

